package cn.wwq.reduce;

import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class JoinReducer extends Reducer<Text,Text,Text,Text> {

    @Override
    protected void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {

        String first = "";
        String second = "";

        for (Text value : values) {
            if (value.toString().startsWith("p")){
                first = value.toString();
            }else {
                second = value.toString();
            }
        }

        if (first.equals("")){
            context.write(key,new Text("NULL"+"\t"+second));
        }else {
            context.write(key,new Text(first+"\t"+second));
        }
    }
}
